From the prior art it is known that a selective modification of heat transfer
surfaces may lead to an improvement of heat transfer rates. For evaporation
processes, often the heat transfer surfaces are roughened, coated with porous
material or structured by electro-deposition. In this study micro structures are
investigated to increase the heat transfer coefficient for heat transfer by nucleate
boiling. Applying micro milling and sand-blasting, different micro structures are
machined in aluminum plates. A specially developed test bench is used for
measuring the heat transfer coefficients for different heat fluxes. The
experimental setup and the experimental procedure are described in this paper.
By comparing the measurement results it is analyzed as to which structures are
most appropriate for heat transfer by nucleate boiling.
Keywords: nucleate boiling, heat transfer, micro structures, micro
manufacturing technologies, experimental verification.